lcd无法显示字符

请各位帮忙看看有什么问题，先谢谢了
lcd有反应但是就是无法显示字符
源程序：
#include<reg52.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
#define NOP _nop_( )
sbit RS=P2^5;
sbit RW=P2^6;
sbit E=P2^7;
void delay(int ms) //延时程序
{
int i;
while(ms--)
{
for(i = 0; i< 250; i++)
{
_nop_();
_nop_();
_nop_();
_nop_();
}
}
}
uchar read_busy( )//读忙标志位
{
uchar chr,temp=0;
P0=0x00;
RS=0;
RW=1;
E=0;
NOP;
NOP;
E=1;
chr=P0;
while(chr&&0x80)
{temp=1;}
return temp;
}
void write_cmd(uchar a)//写指令
{
while(read_busy( ));
RS=0;
RW=0;
E=0;
NOP;
NOP;
E=1;
P0=a;
NOP;
NOP;
NOP;
E=0;
NOP;
NOP;
RS=1;
RW=1;
}
void write_data(uchar temp) //写数据
{
while(read_busy( ));
RS=1;
RW=0;
E=0;
NOP;
NOP;
E=1;
P0=temp;
NOP;
NOP;
E=0;
NOP;
NOP;
RS=0;
RW=1;
}
void unitlcd( ) //程序初始化
{
delay(15);
write_cmd(0x38);
delay(5);
write_cmd(0x38);
delay(5);
write_cmd(0x38);
delay(5);
while(read_busy( ));
write_cmd(0x38);
delay(5);
while(read_busy( ));
write_cmd(0x06);
//while(read_busy( ));
//write_cmd(0x14);
delay(5);
while(read_busy( ));
write_cmd(0x0e);
delay(5);
while(read_busy( ));
write_cmd(0x01);
}
uchar address(uchar tap)//取地址值
{
return(tap|0x80);
}
void display(uchar temp1,uchar temp2)//写入地址和数据
{
while(read_busy( ));
write_cmd(address(temp1));
delay(15);
while(read_busy( ));
write_data(temp2);
}
void main( )
{
unitlcd( );
while(1)
{
display(0x01,'a');
display(0x41,1);
}
}


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